Electric bell.



D. G. WILLIAMS.

ELECTRIC BELL. APPLICATION FILED JULY 20. 1911.

1,283,388. Patented Oct. 29, 1918.

2 SHEETS-SHEET l.

0.. e. WILLIAMS. ELECTRIC BELL.

APPLICATION FILED JULY 20, 19!].

1,283,388. Patented Oct. 29, 1918.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

DANIEL G. WILLIAMS, OF TAUNTON, MASSACHUSETTS.

ELECTRIC BELL.

Application filed July 20, 1917.

To all whom it may concern:

- Be it known that I, DANIEL G. WILLIAMS, a citizen of the United States, residin at Taunton, in the county of Bristol and S tate of Massachusetts, have invented certain new and useful Improvements in Electric Bells, of which the following is a specification.

This invention relates to an improved electric bell and has as its primary object to provide a device of this character particu larly adapted for use with alternating currents and so constructed that the tapper of the bell will have an isochronal movement to thus produce an even and uniform resonance of the gong.

The invention has as a further object to provide a bell which, while being especially adapted for use with an alternating current, may also be used with a direct current with equally good results.

And the invention has as a still further object to provide. a bell which will be characterized by simplicity to thus be capable of inexpensive manufacture while at the same time the device will prove thoroughly eflicient in use.

Other and incidental objects will appear as the description proceeds and in the drawings wherein I have illustrated the preferred embodiment of the invention and wherein similar reference characters designate corresponding parts throughout the several views:

Figure 1 is a plan view of my improved bell,

Fig. 2 is a side elevation of the device,

Fig. 3 is a transverse sectional view showing the mounting of the circuit breaker rod of the bell,

Fi 4 is a fragmentary side elevation of a slightly modified form of the invention,

Fig. 5 is a face view showing a still further modification of the invention,

Fig. 6 is a side elevation of the modification shown in Fig. 5,

Fig. 7 is a transverse sectional view taken on the line 77 of Fig. 5, and looking in the direction of the arrows, and

Fig. 8 is a detail perspective view of the pole block employed in connection with this latter modification.

In carrying out the invention, my improved bell is formed with a suitable base 10 provided at one end Witha reduced extension 11 upon which is mounted a gong 12. Upstanding from the base adjacent one side edge thereof is a pole block or yoke 13 Specification of Letters Patent.

Patented Oct. 29, 1918.

Serial No. 181,829.

formed at its upper extremity, as particularly shown in Fig. 2, with a recess 1 1 in the outer side thereof. Suitably connected with the pole block 13 are electro-magnets 15. Arranged to cooperate with the said magnets is an armature 16 pivoted upon a post 17 upstanding from the base and provided at its free end with a tapper 18 to strike the gong 12. At its inner end the armature 16 is formed with an arm or lever 19 to which is connected one end of a retracting spring 20 for the armature. The opposite end of this spring is engaged with a regulating screw 21 therefor, the said screw being adjustable upon a post 22 upstanding from the base adjacent its lower edge.

Upstanding from the base 10 adjacent the pole block 13 is a post 23 and connected with this post is a spring contact 2% provided at its free end with a suitable contact point arranged to cooperate with a contact screw 25 adjustable upon a post 26 mounted upon the base and insulated with respect thereto. As shown in full lines in Fig. 1 of the drawings, the contact 2% is arranged to normally engage the said screw. In this connection, it should also be observed that the post 23 is insulated in any approved manner from the base 10.

Mounted upon the base 10 between the electro-magnets 15 is an upstanding post 27 which slidably receives a circuit breaker rod 28. As shown in detail in Fig. 3 of the drawings, the rod 28 is formed with a flat portion 29 extending through the post for holding the said rod against turning movement. At one extremity the rod 28 is freely fitted through the pole block 13 and is equipped with an armature 30 overhanging the recess 14 of the said block. Since the rod is held against turning movement upon the post 27, the armature 30 will be supported by the rod to extend longitudinall of the said recess. Interposed between the annature and the spring contact 21 is an insulating button 30 connected in any approved manner with the armature. At its opposite extremity, the rod 28 is loosely fitted through a slot 31 in the armature 16 and is equipped with a stop collar 32. Intel-posed between this collar and the said armature is a cushioning spring 33 for the armature. At the inner side of the armature 16 the rod 28 is further equipped with a stop 3% disposed, when the armature 30 of the said rod is in normal position seating against the pole block 13, in the path of the inward pivotal movement of the armature 16 toward the electro-magnets 15. Mounted upon the rod between the post 27 and pole block 13 is a stop collar 35 and interposed between this collar and the said post is a spring 36 normally tending to unseat the armature 30. i

Mounted upon the base 10 adjacent its lower edge and suitably insulated with respect thereto are binding posts 37 and 38 respectively. A circuit wire leads, as shown in dotted lines in Fig. 1, from the post 37 to the post 23 of the spring contact 24-. A circuit wire leads from the post 26 of the contact screw 25 to one terminal of the winding of the uppermost magnet 15. The other terminal of the winding of this magnet is connected to one terminal of the winding of the lowermost magnet and leadin from the other terminal of the winding OI the lowermost magnet is, as also shown in dotted lines in Fig. 1, a circuit wire connected to the binding post 38. I

As will now be understood, current supplied to the binding post 37 will flow to the post 23 and through the contact 2 to the binding screw 25 and post 26, whence the current will return through the magnets 15 to the post 38 for energizing the magnets. Upon the energization of the magnets 15, the armature 16 will be attracted thereby and thus move the tapper 18 to strike the gong. At the time the armature has nearly reached the limit of its inward movement, as shown in dotted lines in Fig. 1, the said armature will strike the stop 3% and accord ingly shift the rod 28 inwardly to engage the contact 2 1 and move the said contact out of engagement with the contact screw to accordingly break the circuit between the said contact and screw. The magnets 15 will then be deenergized when the spring 20 will retract the armature 1G for another stroke of the tapper. Upon .the retraction of the armature 16 by the'spring 20, the armature will be moved to engage the spring 33 and retract the rod 28. At the same time, the spring 33 will act to cushion the armature in its outward movement. Retraction of the rod 28 will again permit the contact 2 1 to engage the screw when the electromagnets 15 will again be energized to cause the actuation of the tapper 18. Thus, the hell will continuously operate to ring the gong 12 so long as the circuit to the bell is closed,

Attention is now directed. to the fact that the spring 36 upon the circuit breaker rod 28 has a tension upon the said rod tending to open the contact 2 1 slightly greater than the tension of the said contact to engage the screw 25. However, the spring 20 acting upon the armature 16 is adjusted to overcome the differencein the tension between the spring 36 and contact 24 so that the said contact will be normally closed. During the interval of the inward pivotal movement of the armature 16, the rod 28 will be freed by the said armature and in order to hold the rod away from the spring contact 24 during such interval, the armature 30 upon the rod is provided. Upon the energization of the magnets 15, the pole block 13 will, of course, also be energized. Owing to the provision. of the recess 1a in the said block a slight magnetic leakage will occur at the said recess to accordingly attract the armature 30 and maintain the said armature seated against the pole block for holding the rod 28 away from the spring contact 24. Consequently, the rod 28 will not shift under the influence of the spring 36 until the armature 16 has moved to engage the stop 84 upon the said rod and unseat the armature- 30 when the tension of the said spring together with the force of the armature 16 will quickly move the rod to open the said contact. This being accomplished, the spring 36 will then act upon the rod 28 to hold the contact open until the armature 16 is again retracted.

It will accordingly be seen that since the spring contact 2% is normally closed and the operation of the tapper armature 1G is controlled by the circuit breaker rod 28 which is arranged to open the said Contact, the armature 16 will have an isochronal movement to cause an even and uniform vibration of the tapper against the gong and a correspondingly uniform. resonance of the said gong. I thus provide a bell which is particularly adapted for use with an alternating current and which will eliminate the irregular movement of the tapper armature as now commonly experienced with bells of ordinary construction when used with an alternating current. However, it .will be seen that my improved bell may be employed with equally good results in connection with a direct current. Furthermore, the bell is of simple construction and'may therefore be inexpensively manufactured.

In Fig. 1 of the drawings I have illustrated. a slightly modified form of the invention wherein a yoke or pole block 39 is employed. The central portion of this pole block is cut away as shown at 10. The pole block 39 corresponds to the pole block 13 in the preferred form of the invention and mounted to cooperate with the said pole block is an armature 41 upon a circuit breaker rod 12, these parts corresponding to the armature 30 and rod 28, as previously described. Upon the energization of the pole block 39, magnetic leakage will occur at the recess 10 or cut away portion of the block to accordingly attract the armature 41. This armature is preferably in the nature of a disk so that even should the rod 42 rotate, the disk will, nevertheless, be arranged to properly eoiiperate with the pole block 39. Accordingly, in this modified construction, it becomes unnecessary to provide the rod 42 with a flattened portion similar to the flattened portion 29 of the rod 28, as in the preferred form of the invention. Otherwise, this modification is identical with the preferred construction and a further description of such modification is accordingly deemed unnecessary.

In Figs. 5, 6, 7 and 8 of the drawings, 1 have illustrated a still further modification of the invention. In this modification the device is formed with a base 41-3 upon which is mounted a pole block 44. This block is illustrated in detail in Fig. 8 of the drawings and as therein shown is provided with a circular recess 4.5. Mounted upon the said block are electromagnets 46. Arranged to cotiperate with the said magnets, as in the preferred form of the invention, is an armature 4C7 equipped at its inner extremity with a retracting spring 48. Upstanding from the base adjacent its upper extremity is a post 4 9 and adjustable upon this post is a contact screw 50. Arranged to cotiperate vith the said screw is a spring contact 51 normally engaging with the screw. Upstanding between the electro-magnets is a post 52 and slidable upon this post is a cir cuit breaker rod 53 which is freely fitted through the pole block 44: axially of the recess d5 therein. At its opposite extremity, the rod 53 is loosely fitted through a suitable recess in the armature 47 and receives a cushioning spring 54:. Mounted upon the said rod to cotiperate with the armature is a collar Fixed upon the rod 53 to cooperate with the pole bloc: 4A is an armature 56 arranged to overlie the recess #15 in the said block and interposed between the 1 said armature and the spring contact 51 is an insulating button 57 secured in any approved manner to the said armature. All of these parts as thus described are similar to the corresponding parts of the preferred form of the invention and operate in a similar manner, the present modification he ing tol do particularly with the character of spring employed in lieu of the spring 36 of the preferred construction. Upstanding from the base 43 at the inner side of the pole block 14 is a boss 58 upon which is mounted angle spring One arm of this spring is secured to the said boss by a screw or other suitable fastening device 60 while the other arm of the said spring is arranged to project upwardly for engagement with the inner side of the armature 56. Freely fitted through the fixed arm of the said spring and threaded into the base is a tensioning screw 61 which is equipped with a lock nut 62. As will now be seen, the screw 61 may be adjusted for regulating the tension of the spring 59 against the armature 56 for acting upon the rod 53 to open the spring contact 51. This spring will, therefore, hold the said spring contact open in order that the armature 47 may be retracted by the spring 48, the spring 59 operating in a manner similar to the spring 36 of the preferred form of the invention and serving a similar function. Since the operation of this modi fied structure is otherwise identical with the preferred construction of the invention, further description is believed unnecessary. However, it should be stated in connection with each of the modified forms of the invention as well as with reference to the preferred construction that for high efficiency work it would be necessary, in each instance, to make the magnetic circuit of sheet steel laminations.

Having thus described the invention, what is claimed as new is:

1. A device of the character described including a base, an eleetro-n'iagnet mounted thereon, an armature arranged to coiiperate with the magnet, a contact included in circuit with the magnet and normallyclosed, and means normally urged to engage the contact but restrained by the armature, the said means being operable by the armature upon the active movement thereof for opening the said contact.

2. A device of the character described in-. cluding a base, an electro-magnet mounted thereon, an armature ar 'anged to coiiperate with the magnet, a contact included in eircuit with the magnet and normally closed, means normally urged to engage the contact and operable by the armature upon the active movement thereof for opening the said contact, and means coiiperating with the armature for norn'ially restraining such first mentioned means.

3. A device of the character desc ibed in cluding a base, an electro-magnet mounted thereon, an armature arranged to cotiperate with the nagnet, a contact included in circuit with the magnet and normally closed, means normally urged to engage the said contact and operable by the armature upon the active movement thereof for opening the said contact, the armature normally restraining the said means, and an armature carried by the said means and arranged to operativcly coiiperate with the magnet for restraining the said means when released by the said first mentioned arn'uiture in its active movemeet.

t. A device of the character described including a base, an electro-magnet mounted thereon, an armature arranged to cooperate withthe magnet, a contact included in circuit with the magnet and normally closed, a rod normally urged to engage the said contact and operable by the said arn'iaturc u on the active movement thereof for opening the contact, the said rod being normally restrained by the armature, and an armature carried by the said rod and arranged to operatively cooperate with the magnet for restraining the rod when released by the said first mentioned armature in its active movement.

5. A device of the character described including a base, an electro-magnet mounted thereon, an armature arranged to cooperate with the magnet, a contact included in circuit with the magnet, a rod normally urged to engage the said contact and fitted loosely through the said armature, cushioning means for the armature carried by the said rod, the said armature normally restraining the rod and being adapted to shift the rod for opening the said contact upon the active movement ofthe armature, and means carried by the rod for restraining the said rod when released by the armature in its active movement.

6. A device of the character described including a base, an electro-magnet mounted thereon, a pole block associated with the said magnet, an armature arranged to cooperate with the magnet, a contact included in circuit with the magnet and normally closed, a rod normally urged to engage the said contact, a stop carried by the said rod and engageable by the armature upon the active movement thereof for shifting the said rod to open the contact, the armature normally restraining the rod, and an armature carried by the rod and arranged to cooperate with said pole block for restraining the rod when released by the said first mentioned armature in its active movement.

7. A device of the character described including a base, an electro-magnet mounted thereon, a pole block supporting the said magnet, an armature arranged to cooperate with the magnet, a contact included in circuit with the magnet and normally closed, a rod slidably fitted through said block and loosely connected with the armature, means normally urging the rod to engage the said contact, means associated with the armature for normally restraining the said rod, a stop carried by the rod and engageable by the armature upon the active movement thereof for shifting the said rod to open the contact, and an armature carried by the rod and arranged to cooperate with the said pole block for restraining the rod when released by the said first mentioned armature in its active movement.

8. A device of the character described including a base, an electro-magnet mounted thereon, an armature arranged to cooperate with the said magnet, a contact included in circuit with the magnet and normally closed, a rod loosely fitted through the armature and normally urged to engage said contact, cusln ioning means between the arn'iature and the said rod, means for retracting the said armature and acting thereon to normally restrain the said rod, means carried by the rod and engageable by the armature upon the active movement thereof for shifting the said rod to open the contact, and means associated with the rod and controlled by the magnet for restraining the rod when released by the said armature in its active movement.

9. A device of the character described including a base, an electro-magnet mounted thereon, an armature arranged to cooperate with the said magnet, a contact included in circuit with the magnet and normally closed, means operable by the armature upon the active movement thereof for opening said contact and retractable by the armature, and yieldable means associated with the said first mentioned means for holding the said contact open to permit the retraction of the armature.

10. A device of the character described including a base, an electromagnet mounted thereon, an armature arranged to cooperate with the magnet, a contact included in circuit with the magnet and normally closed, means normally urged to engage th contact and operable by the armature upon the active engagement thereof for opening the said contact, and means associated with said first mentioned means and controlled by the magnet for restraining such first mentioned means. 7

11. A device of the character described including a base, an electromagnet thereon, an armature arranged to cooperate with the magnet, a contact included in circuit with the magnet, a rod mounted to engage said contact, a spring carried by the rod and normally urging the rod toward the contact, the armature normally restraining said rod and being adapted to shift the rod for opening the said contact upon active movement of the armature, and means carried by the rod for restraining the said rod when released by the armature in its active movement.

12. A device of the character described including a base, an electromagnet thereon, an armature arranged to cooperate with the magnet, a contact included in circuit with the magnet, a rod mounted to engage said contact, a spring mounted upon the base to operatively cooperate with the rod for urging the said rod toward the contact, the armature normally restraining said rod and being adapted to shift the rod for opening the said contact upon active movement of the armature, and means carried by the rod for restraining the said rod when released by the armature in its active movement.

In testimony whereof I afiix my signature.

DANIEL o. WILLIAMS. IL. 5.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

